Patent · US Expired

Circuit arrangement for operating a high-pressure gas discharge lamp

US4816721A · kind A · utility

3Cited by

8References

20Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Hans G. Ganser · Stolberg, DE
Ralf Schafer · Marbach, DE
Hans Peter Stormberg · Stolberg, DE

Key dates

Filing date	Nov 25, 1983
Grant date	Mar 28, 1989
Priority date	—
Expiry date	Nov 25, 2003

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/231
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement for operating a high-pressure gas discharge lamp (3) with a pulsatory direct current produced from an alternating voltage supply (A, B) via a full-wave rectifier (1). The output of the full-wave rectifier is shunted by a series arrangement of a diode (4) and a capacitor (5). The capacitor (5) has a value of 10 nF to 1 .mu.F and a resistor (6), which is high-ohmic with respect to a current limiter (2) in series with the lamp (3), is connected in a current circuit between the end of the capacitor facing the diode and the lamp (3). As a result, a low re-ignition voltage is attained during the head-up phase of the lamp.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.